It could be observed that the top 20 airports with the most departing and arriving flights doesn't vary much. So to simplify the problem, the airports are chosen based on the number of departing flights.

First, a general study on the number of flights departing and arriving at each airport is done. The first 20 airports with the most departing flights are shown below. It could be observed that the top 10 airports with most departing flights are all US airports, whose ICAO code starts with 'K'. xxx So three areas are divided to analyse...

Five US airports and five other airports in the Americas which have the most departing flights are under consideration: KORD, KATL, KDFW, KDEN, KLAX, CYYZ, PANC, CYVR, CYUL, CYYC.